Fixed #12, signature cache, which is now enabled pr. default. Added a cache for the S3 redirect tests, which should limit the number of calls. Added some GC.Collect calls for the S3 backend, as it appears to be leaking HttpWebRequest objects for some reason. git-svn-id: https://duplicati.googlecode.com/svn/trunk@111 59da171f-624f-0410-aa54-27559c288bec